JPS5984264A - Control system for copying machine - Google Patents

Abstract

PURPOSE:To prevent malfunction and to shorten a down time due to a fatal damage by measuring the distance between marks on a photosensitive body, and recording the position when the distance is not specific distance and inhibiting other processes. CONSTITUTION:A discrimination whether a mark signal position obtained by a mark detection sensor 19 is a storage position or not is made. When the position is a miss point, other processes are skipped without being performed and position information for a new miss point is read and stored. Then, a miss point counter counts up by one and when its contents reaches a specific value, copying is disabled and an alarm as a photosensitive body error is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical field The present invention is applicable to, for example, the R + ten thousand control fi111 system using a belt photoreceptor, and more specifically to the Nakashaiso method, which performs timing control by reading marks on the photoreceptor. Regarding control methods.

BACKGROUND ART Conventionally, in a camera that uses a belt photoreceptor, has a reference mark corresponding to a plurality of segments on the belt photoreceptor, and performs timing control by reading the reference mark. Simply set the reference mark (1r + l t by changing the output from the 1jil sensor and adjusting the timing by 1 time.
, Tita. However, according to this conventional control method, the belt! ζ & In the initial state of the light body, there is no interval: c1! Although this is not the case, there have been times when the sensor has erroneously detected the image due to scratches or dust on the belt photoreceptor due to a certain degree of tilting.

Purpose The present invention has been made in order to eliminate the drawbacks of the prior art as described above.
Prevents false detection due to occurrence of scratches, etc., and further 1171:
The present invention provides a control method for a first copying machine that, when the number of dust particles, scratches, etc. exceeds a predetermined number, is given a warning or disables copying, thereby minimizing downtime. That is.

Embodiment FIG. 1 is a diagram showing an example of a belt photoreceptor used in carrying out the present invention, FIG. 2 is a diagram showing an example of a copying machine to which the present invention is applied, and FIG. 3 is a diagram showing an example of a photoconductor to which the present invention is applied. Figure 4 is a signal system diagram for a detailed explanation of the flowchart 1. In flowchart 1, the belt base material (photoreceptor) 10'd', 20a, 20b on the side edge as shown in Figure 1. .

20 The fiducial marks corresponding to the segments of c are each d”te.
.

They are formed at equal intervals of f and the same widths of a, b, and c. This belt base material is formed as an endless belt and is installed at the position shown in FIG. rollers 9 for moving;
The parent image section 16, the fixing section 1:3, and the cleaning section 12 operate. KJ: The Libert photosensitive member 10id rotates in the direction of arrow A, and the first mark is detected by the mark detection sensor 19, and no other operations are performed. When the mark detection sensor 19 detects a mark, it determines whether it is a mark or an error due to scratches, dirt, etc. according to the flow shown in Fig. 4. If it is a mark, the sequence is started and a signal is sent to the lamp regulator. Feed, ramp 2.3
, turn on the +ji' electric corona 18, scan the swinging mirror 4.5 and lens 6, and mirror the light reflected by the document (not shown) set on the contact glass 1 through the lens 6. 7.8, the belt photoreceptor is guided to an exposure station and imaged to form a latent image. This latent image is (J, 1.f' 44 part 16 part surface 6, paper feed tray 1
Transfer corona 1 to the transfer paper sent from 5 at a predetermined timing.
7, the transfer paper is separated by curvature separation,
The separated rolled θ" paper is fixed by the fixing unit 13 and then discharged to the υl+Av\tray 14 outside the machine,
On the other hand, untransferred toner and potential on the segments are cleaned in the cleaning section 12. Note that this series of operations is repeated during continuous copying. If the belt photoreceptor meanders, the meandering is detected by a detection member (not shown), and the meandering correction roller 1 is operated asymmetrically by the meandering correction motor to correct the meandering of the belt photoreceptor.

FIG. 4 is a flowchart for explaining the operation of the present invention. First, reading is continued until a signal that seems to be a mark is input based on the signal obtained from the mark detection sensor 19. It is determined whether the position is a stored position or not. As a means for determining this position, a counter is provided that constantly counts one rotation of the belt-shaped photoreceptor, and the count value is stored as position information.
This storage section may be a nonvolatile RAM section. If the result of the determination is a miss point, the process is skipped without performing any other processing, and if not, it is checked whether a mark signal is constantly output from the mark detection sensor 19 during a predetermined distance of the mark. This predetermined distance 1411 can be determined, for example, by counting basic pulses synchronized with the belt photoreceptor corresponding to the mark widths a, b, and c. If a miss point occurs, a sequence corresponding to the segment is started, and if not, the position information is read and the stiffness is stored in order to make it a new miss point. Next, the miss point counter is incremented by 1, and when this reaches a predetermined count, copying is disabled and a photoreceptor error is alerted. Possible means for this include, for example, voice synthesis, or a display. Further, the 1-system miss point counter may be one that covers the entire area on the belt photoreceptor, one that covers the entire area of the belt photoreceptor, one that continuously covers the miss point portion, or one that has both.

Effects As is clear from the above explanation, according to the present invention, malfunctions caused by scratches, dust, etc. on the belt photoreceptor can be eliminated, and downtime can be extremely shortened in the case of fatal scratches. becomes possible. This is particularly effective when a scratch occurs on the belt photoreceptor, and as a result of further copying, the scratch spreads and becomes larger than the mark.

[Brief explanation of drawings]

FIG. 1 shows -i of the belt photoreceptor used in practicing the present invention.
FIG. 2 is a diagram showing an example of a shuttle camera to which the present invention is applied; FIG. 3 is a signal system diagram for carrying out the operations of the present invention; FIG. 4 is flowchart 1. 10 Heald photoreceptor, 11 Meandering correction roller, 12 Cleaning section, 13 Fixing section,] 6 Developing section, 18
Charged corona, 19 ・Mark detection sensor. Figure 1 Figure 2! Figure 3 Figure 4

Claims (4)

[Claims] (1) A photoreceptor having a plurality of segments, and marks provided on the photoreceptor corresponding to the plurality of segments;
Means for detecting the leading edge of the mark and adding up the distance (one fall) of the mark; and means for making the rear end of the mark a start signal for the photocopying process when the result is a predetermined distance. and a means for storing the position when the result is not a predetermined E M= (when there is a mismark) and preventing other processing from being performed. (2) The pocket camera system according to claim (1), wherein reading of the position of the mismark is skipped thereafter. (3) The dispensing machine control system according to claim (1), wherein a warning is issued when the number of mismarked points exceeds a predetermined number. (4) The feature is that copying is impossible when the number of points of the above-mentioned mismarks exceeds a predetermined number: 1, '14
, the first-ever machine control method described in Wpir section (1) of the white claim.